Yeah that's probably Rose Petal, now that I noticed the horned shadow in the last panel. Maybe it's not a ritual but it has something demonic involved, so do I get partial credit for my previous guess?

Silly Willow, Rose Petal can make you do anything!I've never heard Rose Petal speak that loud before.I was not expecting this, especially out of Rose Petal.In case, you hadn't guessed, i'm pretty sure it's Rose Petal in that doorway.